The Open source software we are going to talk about is Audacity. It is a software that allows you to edit audio tracks in Windows, GNU / Linux and MAC OS X environments.
It is currently in version 2.1.0 and can be downloaded from its official page on this link.


The main features of this software are:

  • Recording
      - Record live audio from microphones, Input line, USB / Firewire devices and others
      - Record audio played by the computer on any Windows machine
      - Timed recording and sound activated
      - Dubbing over tracks to create multi-track recordings
      - Write with very low latency on devices supported in Linux by JACK
      - Record with sampling up to 192Khz. On high resolution devices support up to 384 kHz.
      - 24-bit support in Windows
      - Recording multiple channels simultaneously
      - Display of volume levels before, during and after recording.
  • Import and Export
      - Convert tapes and recordings to digital sound or CDs
      - Import and export to a file of WAV, AIFF, FLAC and Ogg Vorbis formats
      - On-demand import of WAV or AIFF files
      - Imports and exports to all supported libsndfile libraries (GSM 6.10, 32-bit and 64-bit float WAV, RF64, and U / A-Law).
      - Supports additional formats such as AC3, M4A / M4R (AAC), WMA with FFmpeg library
      - Import MPEG audio (MP2 and MP3) through libmad library.
      - Export to MP3 with LAME encoder library.
      - Creation of WAV and AIFF files prepared to be recorded on audio CD.
  • Sound Quality
      - Supports 16-bit, 24-bit and 32-bit Samples
      - Sampling ratios and formats are converted using high quality resampling.
      - Tracks with different sampling ratios are converted automatically in real time.
  • Edition
      - Simple Editing with Cut, Copy, Paste and Delete features
      - Unlimited sequential Undo (with Redo) to step back / forward any number of steps.
      - Editing and mixing a large number of tracks.
      - Tracks may be labeled with the Sync-Lock Tracks feature
      - Drawing tool for changing individual sampling points
      - Envelope tool to fade the volume up or down smoothly.
      - Automatic recovery of Crashs in case the program terminates abnormally
  • Accessibility
      - Tracks and selections can be made with the keyboard
      - Large number of keyboard shortcuts
      - Support for JAWS, NVDA and other screen readers
  • Effects
      - Real-time preview of LADSPA, VST and Audio Unit effects (MAC OS X)
      - Change of pitch without changing time (or vice versa)
      - Removal of static, buzzing or other constant background noise
      - frequency change with equalization, Bass, Treble, Low / High pass filter effects of Notch filter.
      - Frequency selection filtering made in Spectrogram view
      - Volume adjustment with Compression, Amplification, Normalization, Fade, and adjustable fade effects.
      - Removing Vocals from suitable stereo tracks.
      - Create voice-overs using _ Auto Duck_ effect for podcasts
      - Other effects included:
        - Eco
        - Paulstretch
        - Phaser
        - Reverb
        - Reverse
        - Cut Silence
        - Wahwah
      - Execute multiple effects in a project or in multiple files in Batch Processing mode
  • Plug-ins
      - Support for LADSPA, LV2, Nyquist, VST and Audio Unit effects
      - effects written in the Nyquist programming language
  • Analyze
      - Spectrogram view modes to view and select frequencies
      - “Plot Spectrum” window for detailed analysis of frequencies
      - “Sample Data Export” to export to a file containing amplitude values ​​for each samples in the selection
      - Contrast analysis to analyze the means of the RMS volume differences between the voice and the background music
      - support for adding VAMP analysis plug-ins

Useful links:

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